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KING BILLION ELECTRONICS CO., LTD

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HE84G762B

HE80004 Series

June 1, 2004

V0.92

This specification is subject to change without notice. Please contact sales person for the latest version before use.

Make a dummy read to EXMD register to reset the AC pointer.

Set up the address for transferring data by first writing to ACL, and then ACH and ACP with the first

3 writes to register.

Start writing to addressed device by first writing 1 byte of data to EXMD register, clear WR bit of

CMD register and set it again, the AC will increment with each write pulse.

To read addressed device, clear RD bit of EXMC register, read EXMD register and set RD bit again.

The AC will also increment with each read pulse. Read back for verification is optional. Please note

that read back can also be made through external address and data bus when the bus is switched back

to program bus.

Switch back to normal bus for program execution and data access by clearing the DNLD bit of

EXMC register.

Please note that NOR FLASH memory from different manufacturers such as Intel, AMD, SST, etc.

requires various command sequence to set up. Programmer still needs to follow the respective

specifications of the vendors.

8. LCD Display RAM Map

The gray-scale LCD driver can be configured to be a 16 gray-scale, 4 gray-scales or black and white

display by mask option MO_GRAY_MODE.

MO_GRAY_MODE[1..0]

Gray levels

2 (B/W)

For 4 gray-scale display, 2-bit of RAM is required for each pixel and 4 bit for 16 gray-scale display, 1-bit

for black and white display. For different LCD configuration, the LCD display RAM is arranged

differently. The following figure shows one byte of RAM in different LCD configurations:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Black/White

SEG7

SEG6

SEG5

SEG4

SEG3

SEG2

SEG1

SEG0

4 Gray scales

SEG3

SEG2

SEG1

SEG0

16 Gray scales

SEG1

SEG0

The 16 Gray Scale register GRAY0 ~ GRAYF is the mapping register between the levels selected in

RAM and the real gray scale. In other words, if the content of GRAY0 is 0x03, when value of a certain

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